Statistical Analysis. Percentage data on Orobanche
germination and necrosis of radicle was approximated to
normal frequency distribution by means of angular transformation
and submitted to analysis of variance (ANOVA).
Parasitic radicle growth was adjusted to the dose response
curves caused by each allelopathic metabolite by means of
regression analysis (linear, quadratic, cubic, and exponential) on
the basis of determination coefficient and ANOVA regression
significance (Supporting Information Table S1). All analyses
were conducted using SPSS 21.0.